The arm on the left side of the drawing looks pretty good in perspective, but the one on the right side, is much too short, unless he is a midget, and even then... More roundness/angle would be showing of the back/ribs there, as his back would be arched with his chest sticking out like that. His head is awfully big for how short the body is, and the body is too short for the width as well. Fix a few of the parts and it would look cool.

So far the head, arm on the left, and chest are the best, the stomach isn't bad, perhaps short?